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<title>练手一a</title>
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      <li><a class="btn btn-primary" data-loding-text="Loading..." href="#">变宽</a></li>
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     <li><a class="btn btn-primary" data-loding-text="Loading..." href="#">变色</a></li>
     <li><a class="btn btn-primary" data-loding-text="Loading..." href="#">隐藏</a></li>
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